AS209870 ASPA Check - Cylo

Published

Cylo Cylo Ltd🇬🇧 - ASPA check for AS209870: the upstream transit providers AS209870 has authorized in its RPKI Autonomous System Provider Authorization (ASPA) object, and the networks that list AS209870 as their provider. Routers that validate ASPA use these records to detect route leaks in BGP paths.

ASPA Status
Published
Upstream Providers
2
Downstream Customers
0

How to read this ASPA check

The 2 providers below are the only networks allowed to appear directly above AS209870 in an AS-path. If AS209870 uses a transit provider that is missing from this list, routers that enforce ASPA treat its routes through that provider as invalid, so the list should include every current and backup transit provider. Peers do not belong in it.

Step-by-step ASPA check guide - including how to validate an AS-path hop by hop.

Peering Topology

AS209870 peering topology: 2 upstream providers and 0 downstream customersUpstreams: AS174, AS43861. No downstreams.AS209870 - Cylo Cylo LtdAS209870Cylo Cylo LtdAS174COGENT-174 - Cogent C…AS174 - COGENT-174 - Cogent Communications, LLCAS43861CIRCLEB-ASN Circle B …AS43861 - CIRCLEB-ASN Circle B B.V.UPSTREAMSDOWNSTREAMS

Upstream Providers(2)

AS209870 authorizes these ASNs as upstream transit providers.

ASNName
AS174🇺🇸COGENT-174 - Cogent Communications, LLC
AS43861🇳🇱CIRCLEB-ASN Circle B B.V.

ASPA object expires: 2026-10-27

Related Tools and Guides

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